The LM140/LM340A/LM340/LM7800C monolithic 3-terminal positive voltage regulators employ internal current-limiting, thermal shutdown and safe-area compensation, making them essentially indestructible.
If I accidentally had my jumpers hooked to the 12v from the batteries with the cap across them would that have blown the LED's? It's the only thing I can think of...
The resistors are yellow-yellow-brown-gold.
I did have a 10 uf cap on the other part of the board which may have still been connected across the + and -... I took everything off the board when things got wonky and all seems well now.
About the 8XAA, I'm just using it because it's convienent. I thought that the circuit wouldn't pull any more current through the VR than the circuit requires? I guess I'm misunderstanding some things.
Thanks for the help! I'd like to figure this out so it won't happen again in the future!
How big was the heatsink